15 
although A. pwnctipennis might be above in live water and A. quad¬ 
rimaculatus below in the bayou. 
The breeding was profuse in patches, but there were large areas 
without larvae. Some of these places seemed to be physically well 
suited for breeding and no reason was apparent why breeding was 
not taking place. There was more production within a mile of 
Sulphur Creek bayou than we found in the same area anywhere else. 
Indeed, in only a few other places, as at the mouth of Coagi Creek 
bayou, south side, in some bights of the lower Waxahatchie, and in a 
small place in Cedar Creek bayou were larvae found in even con¬ 
siderable numbers. We did not go into every bight and creek of the 
pond, but a fairly close survey was made from Cedar Creek to the 
dam. There was a large water weed growing on logs, hammocks, 
etc., and along the edges of the pond, with a big bunch of white roots 
which reached down into and floated about in the water. Never did 
we find larvae among these roots, even when some floatage was ad¬ 
hering to them. The same weed and same absence of larvae were 
seen in the two ponds in South Carolina. Larvae were not found 
in grass recently dead and rotting. Aquatic vegetation, except algae, 
is not a factor in mosquito production in this pond at present. On 
the contrary, algae were found to be a prominent factor in the 
August and September survey. Minnows were not generally abund¬ 
ant in this pond. In some places good schools of them were seen, but 
they were not common. Yet larvae were practically absent unless 
protected by floatage or other cover. Minnows were decidedly more 
abundant than in 1914. 
Species of Anopheles in fall. —As A. quadrimaculatus was prac¬ 
tically not found in this pond during the survey of October and 
November, 1914 (except in one place on Paint Creek), nor in the 
June survey of this year, but was the most common form found 
there during the survey of August and September, it seemed desir¬ 
able to see if it again disappeared in advance of A. punctipennis in 
the fall. One of our party (Griffitts) therefore returned to Talladega 
Springs October 26-30. The weather, however, was reported as hav¬ 
ing been unusually warm for the season. Dipping Sulphur Creek 
Bayou, Bock Spring Bight, the Bait Holes, and other places in the 
pond which had given such a high percentage of A. quadrimaculatus 
(88 per cent), he found: 
Per cent. 
A. punctipennis___ 71 
A. quadrimaculatus_ 19 
A. crucians (from “Bait Holes” as before)-. 10 
< 
Evidently the ratio of the species had changed, and the evidence 
was that this was due to the diminution of the Anopheles quadri¬ 
maculatus. 
